EP0535287A1 - Method and apparatus for improving handle and surface of fabrics and knitgoods - Google Patents

Abstract

The material web (3) to be treated is continuously fed to a first material web storage (1) and stored there in sections, removed pneumatically conveyed from there and flung against a first impact surface (4). The goods (3) compressed in this way are then fed to a second web store (2) and are stored there in sections. The same process is then carried out in the reverse direction of conveyance from the second web store (3) against a second baffle surface (4 ') and then into the first web store (1), but with a lower web length feed, this alternating movement is repeated alternately, and the feed difference between this back and forth moving web length sections continuously discharged from the second web store (2). <IMAGE>

Description

The invention relates to a method for continuously improving the grip and surface of textile fabrics and knitted fabrics, as well as a device for carrying out this method.

When finishing textiles, greater softness would often be desirable, i.e. a better grip and surface improvement.

The object of the present invention is in particular to create a method by means of which a grip and surface improvement, that is to say a greater softness of textile fabrics and knitted fabrics can be achieved.

This object is achieved according to the invention in a method of the type mentioned at the outset by continuously feeding the web to be treated to a first web store and storing it section by section, removing it pneumatically conveyed from there and hurling it against a first impact surface, then throwing the compressed product to a second one Feeds material store and stores there in sections, then carries out the same process in the opposite direction from the second material store against a second baffle and then into the first material store, but with a lower material length feed, repeats these alternating movements alternately, and thereby the feed difference between them forth moving web length sections continuously from the second web store.

It can be advantageous if the goods removed from the second web store are subsequently subjected to the same treatment process at least once again.

It is expedient if the web of material to be treated is thrown against the respective impact surface at a speed in the range from 400 to 100 m / min, preferably at a speed in the range from 600 to 800 m / min.

In order to achieve a loose storage of the goods to be treated and a problem-free simultaneous removal of them from the web store, it is advantageous to if the goods to be treated are temporarily stored in sections in at least approximately U-shaped web stores, the goods to be treated and temporarily stored being continuously introduced into one leg part of the first U-shaped web store, continuously alternately and in sections being removed from the other, second leg part , in the opposite direction of transport returns to it, removes it again and so on, continuously introduces the treated goods alternately and in sections into one leg part of the second web store, removes it again in the opposite direction of transport, returns it to the same and so on, and that's it treated goods continuously removed from the other second leg part of the second U-shaped web store.

In order to avoid that the two web stores are both overfilled on the one hand and emptied too little on the other, it is expedient if the back and forth movement of the web sections to be treated between the two baffle surfaces by means of the filling level of the two web stores monitoring the latter, preferably optical monitoring devices Scanning means is controlled.

Advantageous further developments of the method according to the invention are the subject of claims 6 to 9.

The invention further relates to a device for carrying out the method according to the invention, which is characterized in that it has two web store for loosely receiving one web section each, one arranged between these two web stores interconnecting and guiding in its longitudinal direction on its two end faces, each delimited by a web impact surface, web guiding and acceleration channel, connected to the latter, in the two mutually opposing longitudinal directions of which pneumatic pneumatic conveying means, which can be switched into effect, for alternating conveyance of a web section in the opposing longitudinal directions of Guide and acceleration channel against the respective web impact surface arranged at the end and from this into the respectively assigned web store, a feed arrangement for the continuous feed of the web to be treated into the first web store, and a discharge arrangement for the continuous removal of the treated web from the second web store.

It is advantageous if the two web stores are at least approximately U-shaped and are preferably provided in their interior with optical scanning means for scanning their degree of filling with sections of the web to be treated, one leg of the U-shaped first web store for continuous, temporary , section-wise pick-up of the goods to be treated and the other leg for continuously alternating and section-wise removal, return in the opposite direction of transport, re-removal and so on, and the one leg of the U-shaped second web store for continuously alternating and section-wise pick-up, counter-directional removal , renewed recording and so on, and the other leg of the second web store is designed for the continuous removal of the treated goods.

In order to achieve rapid acceleration, which nevertheless does not negatively influence the goods to be treated, it is expedient if the pneumatic conveying means assigned to the accelerating channel are subdivided into two pneumatic conveying means groups acting in opposite directions of the accelerating channel, and these two groups are alternately separated via a preferably after the Principle of the Cuanda effect switching element, are connected to a compressed air source, these two groups alternatingly arranged laterally offset on both sides of the acceleration channel, blowing nozzles directed obliquely to the web transport plane and are arranged in their respective conveying direction in the end region of the acceleration channel.

In order to achieve greater flexibility in the operation of the device according to the invention, it is advantageous if the feed and discharge arrangement are designed to be independently controllable with respect to their transport speed.

In order to avoid an air cushion reducing the compression effect, it is also advantageous if the material web impact surfaces have a lattice structure and are curved outwards and downwards to accommodate a material web section that is thrown against it.

In order to obtain the lowest possible residual shrinkage potential at the outlet of the device, it is expedient if at least one shrink dryer is connected upstream of the first web store and / or the second web store at least one shrink dryer is connected. It is particularly advantageous for the treatment of plush and terry goods if the at least one shrink dryer for receiving and transporting the goods to be treated through the shrink dryer and for dispensing the goods emerging from the latter into the first web store or for receiving the goods from the second or last goods web storage goods delivered is provided with a continuously drivable, air-permeable, endlessly rotating conveyor belt, which has an upper, stationary and air-permeable boundary wall to form a transport channel which is limited in the vertical direction up and down and serves to receive and support the goods to be treated vertically is arranged, which is penetrated by downwardly directed, transverse to the web conveying direction blowing nozzles, and that preferably viewed in the direction of goods pass B offset to the latter arranged below the upper run of the lower conveyor belt, preferably The upper run of the latter is supported by blowing nozzles that are directed upwards. Appropriate further developments of the shrink dryer are the subject of claims 18 to 22.

Fig.1

einen Längsabschnitt durch eine beispielsweise Ausführungsform einer erfindungsgemässen Vorrichtung;

Fig.2

in vergrössertem Massstab einen Bauteil der in Fig. 1 dargestellten Vorrichtung;

Fig.3

in vergrössertem Massstab einen Längsschnitt durch den Führungs- und Beschleunigungskanal des in Fig. 2 dargestellten Bauteiles; und

Fig.4

den Ausschnitt A in Fig. 1 in vergrössertem Massstab.

The invention is explained below with reference to the drawing, for example. It shows

Fig. 1

a longitudinal section through an example embodiment of a device according to the invention;

Fig. 2

on an enlarged scale a component of the device shown in Fig. 1;

Fig. 3

on an enlarged scale, a longitudinal section through the guide and acceleration channel of the component shown in FIG. 2; and

Fig. 4

the section A in Fig. 1 on an enlarged scale.

As can be seen in particular from FIGS. 1 and 2, the device shown has two approximately U-shaped web stores 1 and 2 for loosely accommodating one web section 3 'and 3' 'each, and one arranged between these two web stores 1, 2, connecting them and in its longitudinal direction on its two end faces delimited by a web impact surface 4 and 4 'web guiding and acceleration channel 5.

Pneumatic conveying means 6 and 6 'connected to the latter 5, in the two opposite longitudinal directions of which can be switched in effect, serve for alternating conveyance of a web section of the web 3 to be treated in the opposite longitudinal directions 7,7' (FIG. 3) of the guide and acceleration channel 5 against the respective web impact surface 4 or 4 ′ arranged on the end face and from this into the respectively assigned web store 2 or 1 arranged below the latter.

This component 8 can be used on its own or, as in the exemplary embodiment shown, for example with two shrink dryers 9 and 9 'arranged on the inlet side, the latter also serving as a feed arrangement 9' for the continuous supply of the web 3 to be treated into the first web store 1.

To control the conveying direction of the pneumatic conveying means 6, 6 ', optical scanning means 10 and 10' are provided in the lower deflection areas of the two web stores 1 and 2 in order to fill the degree of filling of the two web stores 1 and 2 with sections 3 'and 3' 'of those to be treated Scan web 3.

In order to achieve the opposite directions of conveyance of the goods 3 to be treated, the pneumatic conveying means assigned to the acceleration channel 5, as can be seen particularly in FIG. 3, are divided into two pneumatic conveying means groups (blowing nozzles) 6 and 6 'acting in opposite directions of the acceleration channel 5. These two blow nozzle groups 6 and 6 'are alternately separated e.g. connected to a compressed air source 12 via a flip-flop switching element 11 (see FIG. 2) which operates on the principle of the Coanda effect. Depending on the material, the air used can have a temperature in the range of, for example, approximately 80 to 200 ° C.

As can be seen in particular from FIGS. 1 and 4, the two shrink driers 9 and 9 'are for receiving and transporting the goods 3 to be treated through the shrink driers and for dispensing the goods 3 emerging from the shrink dryer 9' into the first web store 1 provided with a common, continuously drivable, air-permeable, endlessly rotating conveyor belt 13, which is driven at a conveying speed of about 40 to 50 meters per minute. An upper, stationary and air-permeable boundary wall 15 is arranged in the latter to form a transport channel 14 which is limited in the vertical direction at the top and bottom and serves to receive and support the goods 3 to be treated. which is penetrated by downwardly directed blowing nozzles 16 which run transversely to the direction of web conveyance.

To achieve the lowest possible residual shrinkage potential, the upper, air-permeable perforated boundary wall 15 has at least approximately the shape of a shed roof, as seen in a vertical section running longitudinally to the web transport direction (see in particular FIG. 4), with between two mutually adjacent angular sections 15 ', 15 ″, 15 ″ ″, etc., each has a downwardly directed blowing nozzle 16, which are simultaneously designed to support the assigned sections 15 ′, 15 ″, 15 ″ ″, etc.

For optimal individual adaptation of the flow conditions to the tissue to be dried, the distance a between the upper blowing nozzles 16 and thus the upper boundary wall 15 supported on them is opposite the bearing surface b of the conveyor belt 13, e.g. adjustable in a range of approximately 10 to 80 mm.

Viewed in a horizontal plane, two lower blowing nozzles 17, which support the upper run of the conveyor belt 13 and are directed upward into the associated angular sections 15 ', 15' ', 15' '' etc. of the upper boundary wall 15, are provided between two upper blowing nozzles 16 .

The lateral horizontal spacing of the upper blowing nozzles 16 from one another is approximately 190 mm and that of the lower blowing nozzles 17 from each other is approximately 95 mm.

The upper and lower, blowing air supplying blowing nozzles 16 and 17 are each divided into groups and by switching means 18 can be connected to a hot air source 19 about 2 times per second in an alternating and pulse-like manner. The subdivision and switching is designed in such a way that each active blow nozzle group is opposed by an inactive blow nozzle group and the blow nozzle groups immediately adjacent to the side of an active blow nozzle group are inactive. In this way it is ensured that, alternately, a section of the goods 3 passing through a shrink dryer 9 or 9 'is always pressed down by upper blow nozzles 16 onto the bearing surface b of the endlessly rotating conveyor belt 13 and thus inevitably together with the latter by the corresponding shrink dryer 9 or 9 'is transported through.

The pulsating and alternating loading of the goods moving through the shrink dryer from below and from above with hot air blows, the resulting fluttering movement of the goods 3 in the vertical direction of the transport channel 14 and the simultaneous compression of the passing goods 3 in the approximately angular, air-permeable sections 15 ', 15' ', 15' '' etc. of the upper boundary wall 15 results in an extremely effective drying, shrinking and relaxing of the goods 3 passing through.

The pretreated fabric 3, which continuously emerges from the second shrink dryer 9 ', arrives with a residual moisture content of preferably less than 20%, but at least 6%, in the first fabric web store 1, where it is stored in sections in a relaxed state. As already mentioned, the web 3 is pneumatically removed in sections from the latter with the aid of the nozzle arrangement 6, in the acceleration channel 5 to a speed of approximately 600 up to 800 m / min, depending on the type of goods, accelerated, and at the end of this acceleration section 5 hurled against the grid-like and arched impact surface 4 and compressed there. The lattice-like and thus air-permeable design of the impact surface 4 makes it impossible to form an air cushion that dampens the impact between the impacting web section and the impact surface 4.

The same process is then repeated with the aid of the nozzle arrangement 6 'acting in the opposite direction from the second web store 2 via the baffle surface 4' into the second web store 1, but with a lower web length feed, these back and forth movements are repeated alternately, and the feed difference that occurs between these web length sections moved back and forth in this way, continuously discharged from the second web store 2 into the subsequent second shrink dryer 10 for the final treatment. The same treatment steps are then repeated in a subsequent, analog component 8 '.

In order to be able to easily accelerate both light and heavy goods through the acceleration channel 5, the two pneumatic conveying means groups 6, 6 'on both sides of the acceleration channel 5 are mutually offset by the distance from one another by the angle y directed obliquely to the web transport plane, whereby a waveform is given through the acceleration channel 5 against the impact surface 4 to be transported 3 in the area of the active blow nozzle group 6 (FIG. 3 on the right), as a result of which the transport air in this area is extremely efficient at the area to be transported Goods 3 attacks and causes a very good transport effect on the same.

Since the two blow nozzle groups 6, 6 ', viewed in the transport direction, are arranged in the respective end region of the acceleration channel 5, any upsetting and jamming of the goods 3 during their transport through the acceleration channel 5 becomes perfect as a result of the tensile force acting on the goods 3 to be transported in this way avoided.

Depending on the type of goods 3, it may also be expedient to supply saturated steam to the nozzle arrangement 6 and / or 6 'when they are used, in order to additionally pass the goods 3 passing through before they enter the second shrink dryer 10 in order to achieve an even stronger and more uniform shrinkage Suspend saturated steam treatment.

Depending on the type of goods 3 and the desired degree of treatment, it may be advantageous, in some circumstances, to connect one or more shrink dryers analogous to the last component 8 ′ to the shrink dryers 9 and 9 ′.

Claims (22)

Process for the continuous improvement of the grip and surface of textile fabrics and knitted fabrics, characterized in that the web (3) to be treated is continuously fed to a first web store (1) and stored there in sections, removed pneumatically from there and compressed against a first impact surface ( 4) hurls, then feeds the product (3) so compressed to a second web store (2) and stores it there in sections, then the same process in the opposite direction from the second web store (3) against a second baffle surface (4 ') and then into the carries out the first web store (1), but with a lower web length feed, repeats these alternating movements alternately, and continuously removes the feed difference between these web length sections moved back and forth from the second web store (2). A method according to claim 1, characterized in that the goods (3) discharged from the second web store (2) are subsequently subjected to the same treatment process again at least once. Method according to Claim 1 or 2, characterized in that the material web (3) to be treated is at a speed in the range from 400 to 100 m / min, preferably at a speed in the range from 600 to 800 m / min, against the respective impact surface (4,4 ') hurls. Method according to one of Claims 1 to 3, characterized in that the goods (3) to be treated are temporarily stored in sections in at least approximately U-shaped web stores (1, 2), the goods (3) to be treated and temporarily stored being stored continuously in one leg part (1 ') of the first U-shaped web store (1), continuously alternately and in sections from the other, second leg part (1''), in the opposite direction of transport back into this, again this and so on , the treated goods (3) continuously alternately and in sections in one leg part (2 ') of the second web store (2), removes it in the opposite direction of transport, returns it again and so on, and the finished goods (3) continuously removes the other second leg part (2 '') of the second U-shaped web store (2). Method according to one of claims 1 to 4, characterized in that the back and forth movement of the web sections to be treated between the two baffle surfaces (4,4 ') by means of monitoring means (10,10') scanning the filling level of the two web stores (1,2). ), preferably optical scanning means, is controlled. Method according to one of claims 1 to 5, characterized in that the pneumatic conveyance of the web (3) to be treated between the two baffle surfaces (4,4 ') with the aid of bilaterally offset and laterally offset from each other, directed obliquely to the web transport plane, blowing nozzles arranged immediately in front of the impact surfaces (4, 4 ') to be acted upon (FIG. 3). Method according to one of claims 1 to 6, characterized in that the areas of the goods to be treated which first enter the first web store have a residual moisture of at most 35%, preferably less than 20%, but at least 6%. Method according to one of claims 1 to 6, characterized in that the goods to be treated are pretreated in at least one shrink dryer before they first enter the first web store. Method according to one of Claims 1 to 8, characterized in that the goods to be treated are subjected to saturated steam treatment during their transport from a web store (1, 2) to the impact surface (4 or 4 ') which is effective downstream. Apparatus for carrying out the method according to claim 1, characterized in that it has two web stores (1, 2) for loosely receiving one web section each, one between these two web stores (1, 2), connecting them to one another and in the longitudinal direction on both of them Front sides of a material web impact surface (4,4 ') delimited material web guide and acceleration channel (5), connected to the latter, in the two mutually opposite longitudinal directions of which pneumatic conveying means (6,6') which can be switched into effect for the alternating conveyance of a material web section in the opposite longitudinal directions (7,7 ') of the guiding and acceleration channel (5) against the respective web impact surface (4,4') arranged at the front and from this into the respectively assigned web store (2,1), a feed arrangement (3, 3 ') for the continuous supply of the web to be treated in the first web store (1), and a discharge arrangement (3,3 '') for the continuous removal of the treated web from the second web store (2). Apparatus according to claim 10, characterized in that the two web stores (1, 2) are at least approximately U-shaped and preferably have optical scanning means (10, 10 ') in their interior for scanning their degree of filling with partial sections of the web (3) to be treated are, one leg (1 ') of the U-shaped first web store (1) for the continuous, temporary, section-wise reception of the goods to be treated (3) and the other leg (1'') for the continuously alternating and section-wise removal, return directed in the opposite transport direction, re-removal and so on, and the one leg (2 ') of the U-shaped second web store (2) for continuously alternating and section-wise pick-up, oppositely directed removal, re-admission and so on, and the other leg (2 '') of the second web store (2) is designed for the continuous removal of the treated goods (3). Apparatus according to claim 10 or 11, characterized in that the pneumatic conveying means assigned to the accelerating channel (5) is divided into two pneumatic conveying means groups (6, 6 ') acting in opposite directions (7, 7') of the accelerating channel (5), and these the two groups (6, 6 ') are alternately connected to a compressed air source (12), alternately via a switching element (11), which preferably works according to the principle of the Coanda effect, these two groups being alternately laterally offset on both sides of the acceleration channel (5) ( X) have blowing nozzles (6, 6 ') which are arranged at an angle to one another and are arranged in the end region of the acceleration channel (5), as seen in their respective conveying direction. Device according to one of claims 10 to 12, characterized in that the feed and discharge arrangement (3 ', 3' ') are designed to be independently controllable with respect to their transport speed. Device according to one of claims 10 to 13, characterized in that the web impact surfaces (4, 4 ') have a lattice structure and are curved to the outside and downwards to accommodate a web section thrown against them in a compressed manner. Device according to claim 1O, characterized in that several arrangements according to claim 1O are connected together in series. Device according to one of claims 10 to 14, characterized in that at least one shrink dryer (9) is connected upstream of the first web store (1) and / or at least one shrink dryer (10) is connected downstream of the last web store (2). Apparatus according to claim 16, characterized in that the at least one shrink dryer (9, 01) for receiving and transporting the goods (3) to be treated through the shrink dryer and for discharging the goods (3) emerging from the latter into the first web store (1) or for receiving the goods (3) discharged from the second or last web store (2) is provided with a continuously drivable, air-permeable, endlessly circulating conveyor belt (3,), which forms a top and bottom in the vertical direction limited, for receiving and vertical support of the goods to be treated (3) transport channel (14) an upper, stationary and air-permeable boundary wall (15) is arranged, which is directed downward, transverse to the web conveying direction (7,7 ') blowing nozzles ( 16) is interspersed, and that preferably viewed in the direction of goods movement (B) offset to the latter below the upper strand of the lower conveyor belt (3), preferably supporting the upper strand of the latter, upwardly directed blowing nozzles (17) are provided. Apparatus according to claim 17, characterized in that the upper, air-permeable boundary wall (15) seen in a vertical section running longitudinally to the web transport direction (Fig. 4) is at least approximately a wave or shed roof shape, preferably in the form of a plurality of immediately successive ones transverse to the direction of flow extending wall sections (15, 15 ', 15' 'etc.) with an at least approximately angular cross section, between each of which a blow nozzle (16) directed downward is arranged. Apparatus according to claim 17 or 18, characterized in that the upper and lower blowing nozzles (16, 17) are each divided into groups and are connected to a blower (19) via switching means (18), this subdivision and switching being designed in such a way that one active blow nozzle group (16) is opposed by an inactive blow nozzle group (17) and which are inactive immediately adjacent or possibly immediately adjacent blow nozzle groups to the side of an active blow nozzle group, and the respective blow nozzle groups are switched between active and inactive state in a pulsating manner, the switching frequency the switching means is preferably in a range of 1 to 6⁻¹ per second. Device according to one of claims 17 to 19, characterized characterized in that the vertical distance (a) between the outlet openings of the upper and lower blowing nozzles (16, 17) is adjustable, preferably in a range of approximately 10 to 80 mm, and the transport speed of the conveyor belt (3) is preferably 10 to 80, is in particular 30 to 50 m / sec. Device according to one of claims 17 to 20, characterized in that the lateral distance between the upper blowing nozzles (16) in the range from 140 to 220 mm, preferably at least approximately 185 mm, and the lateral distance between the lower blowing nozzles (17) in Range of 70 to 110 mm, preferably at least approximately 95 mm. Device according to one of claims 1 to 21, characterized in that the guide and acceleration channel (5) viewed in its longitudinal direction in a vertical plane is at least approximately undulating.

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